Answer:
C) 7c+6s-63
Step-by-step explanation:
set up this equation because you are adding the two expressions

combine like terms

My answer is should: increase of 4.5
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P.S..If you have options then it's better................
36! goodluck hope it good
Finding three volume is super easy the equation for volume is the area of the base times the height so u will find the area of all the small part and then add those and then multiply by the height